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359 lines
8.6 KiB
359 lines
8.6 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* omap_cf.c -- OMAP 16xx CompactFlash controller driver |
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* |
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* Copyright (c) 2005 David Brownell |
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*/ |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/platform_device.h> |
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#include <linux/errno.h> |
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#include <linux/init.h> |
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#include <linux/delay.h> |
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#include <linux/interrupt.h> |
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#include <linux/slab.h> |
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#include <pcmcia/ss.h> |
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#include <mach/hardware.h> |
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#include <asm/io.h> |
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#include <linux/sizes.h> |
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#include <mach/mux.h> |
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#include <mach/tc.h> |
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/* NOTE: don't expect this to support many I/O cards. The 16xx chips have |
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* hard-wired timings to support Compact Flash memory cards; they won't work |
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* with various other devices (like WLAN adapters) without some external |
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* logic to help out. |
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* |
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* NOTE: CF controller docs disagree with address space docs as to where |
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* CF_BASE really lives; this is a doc erratum. |
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*/ |
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#define CF_BASE 0xfffe2800 |
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/* status; read after IRQ */ |
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#define CF_STATUS (CF_BASE + 0x00) |
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# define CF_STATUS_BAD_READ (1 << 2) |
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# define CF_STATUS_BAD_WRITE (1 << 1) |
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# define CF_STATUS_CARD_DETECT (1 << 0) |
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/* which chipselect (CS0..CS3) is used for CF (active low) */ |
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#define CF_CFG (CF_BASE + 0x02) |
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/* card reset */ |
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#define CF_CONTROL (CF_BASE + 0x04) |
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# define CF_CONTROL_RESET (1 << 0) |
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#define omap_cf_present() (!(omap_readw(CF_STATUS) & CF_STATUS_CARD_DETECT)) |
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/*--------------------------------------------------------------------------*/ |
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static const char driver_name[] = "omap_cf"; |
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struct omap_cf_socket { |
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struct pcmcia_socket socket; |
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struct timer_list timer; |
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unsigned present:1; |
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unsigned active:1; |
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struct platform_device *pdev; |
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unsigned long phys_cf; |
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u_int irq; |
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struct resource iomem; |
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}; |
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#define POLL_INTERVAL (2 * HZ) |
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/*--------------------------------------------------------------------------*/ |
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static int omap_cf_ss_init(struct pcmcia_socket *s) |
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{ |
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return 0; |
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} |
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/* the timer is primarily to kick this socket's pccardd */ |
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static void omap_cf_timer(struct timer_list *t) |
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{ |
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struct omap_cf_socket *cf = from_timer(cf, t, timer); |
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unsigned present = omap_cf_present(); |
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if (present != cf->present) { |
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cf->present = present; |
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pr_debug("%s: card %s\n", driver_name, |
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present ? "present" : "gone"); |
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pcmcia_parse_events(&cf->socket, SS_DETECT); |
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} |
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if (cf->active) |
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mod_timer(&cf->timer, jiffies + POLL_INTERVAL); |
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} |
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/* This irq handler prevents "irqNNN: nobody cared" messages as drivers |
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* claim the card's IRQ. It may also detect some card insertions, but |
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* not removals; it can't always eliminate timer irqs. |
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*/ |
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static irqreturn_t omap_cf_irq(int irq, void *_cf) |
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{ |
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struct omap_cf_socket *cf = (struct omap_cf_socket *)_cf; |
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omap_cf_timer(&cf->timer); |
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return IRQ_HANDLED; |
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} |
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static int omap_cf_get_status(struct pcmcia_socket *s, u_int *sp) |
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{ |
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if (!sp) |
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return -EINVAL; |
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/* NOTE CF is always 3VCARD */ |
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if (omap_cf_present()) { |
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struct omap_cf_socket *cf; |
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*sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD; |
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cf = container_of(s, struct omap_cf_socket, socket); |
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s->pcmcia_irq = 0; |
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s->pci_irq = cf->irq; |
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} else |
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*sp = 0; |
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return 0; |
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} |
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static int |
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omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s) |
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{ |
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u16 control; |
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/* REVISIT some non-OSK boards may support power switching */ |
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switch (s->Vcc) { |
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case 0: |
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case 33: |
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break; |
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default: |
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return -EINVAL; |
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} |
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control = omap_readw(CF_CONTROL); |
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if (s->flags & SS_RESET) |
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omap_writew(CF_CONTROL_RESET, CF_CONTROL); |
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else |
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omap_writew(0, CF_CONTROL); |
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pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n", |
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driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask); |
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return 0; |
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} |
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static int omap_cf_ss_suspend(struct pcmcia_socket *s) |
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{ |
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pr_debug("%s: %s\n", driver_name, __func__); |
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return omap_cf_set_socket(s, &dead_socket); |
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} |
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/* regions are 2K each: mem, attrib, io (and reserved-for-ide) */ |
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static int |
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omap_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io) |
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{ |
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struct omap_cf_socket *cf; |
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cf = container_of(s, struct omap_cf_socket, socket); |
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io->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT; |
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io->start = cf->phys_cf + SZ_4K; |
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io->stop = io->start + SZ_2K - 1; |
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return 0; |
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} |
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static int |
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omap_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map) |
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{ |
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struct omap_cf_socket *cf; |
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if (map->card_start) |
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return -EINVAL; |
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cf = container_of(s, struct omap_cf_socket, socket); |
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map->static_start = cf->phys_cf; |
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map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT; |
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if (map->flags & MAP_ATTRIB) |
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map->static_start += SZ_2K; |
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return 0; |
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} |
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static struct pccard_operations omap_cf_ops = { |
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.init = omap_cf_ss_init, |
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.suspend = omap_cf_ss_suspend, |
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.get_status = omap_cf_get_status, |
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.set_socket = omap_cf_set_socket, |
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.set_io_map = omap_cf_set_io_map, |
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.set_mem_map = omap_cf_set_mem_map, |
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}; |
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/*--------------------------------------------------------------------------*/ |
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/* |
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* NOTE: right now the only board-specific platform_data is |
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* "what chipselect is used". Boards could want more. |
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*/ |
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static int __init omap_cf_probe(struct platform_device *pdev) |
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{ |
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unsigned seg; |
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struct omap_cf_socket *cf; |
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int irq; |
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int status; |
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seg = (int) pdev->dev.platform_data; |
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if (seg == 0 || seg > 3) |
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return -ENODEV; |
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/* either CFLASH.IREQ (INT_1610_CF) or some GPIO */ |
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irq = platform_get_irq(pdev, 0); |
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if (irq < 0) |
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return -EINVAL; |
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cf = kzalloc(sizeof *cf, GFP_KERNEL); |
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if (!cf) |
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return -ENOMEM; |
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timer_setup(&cf->timer, omap_cf_timer, 0); |
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cf->pdev = pdev; |
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platform_set_drvdata(pdev, cf); |
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/* this primarily just shuts up irq handling noise */ |
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status = request_irq(irq, omap_cf_irq, IRQF_SHARED, |
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driver_name, cf); |
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if (status < 0) |
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goto fail0; |
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cf->irq = irq; |
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cf->socket.pci_irq = irq; |
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switch (seg) { |
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/* NOTE: CS0 could be configured too ... */ |
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case 1: |
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cf->phys_cf = OMAP_CS1_PHYS; |
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break; |
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case 2: |
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cf->phys_cf = OMAP_CS2_PHYS; |
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break; |
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case 3: |
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cf->phys_cf = omap_cs3_phys(); |
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break; |
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default: |
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goto fail1; |
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} |
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cf->iomem.start = cf->phys_cf; |
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cf->iomem.end = cf->iomem.end + SZ_8K - 1; |
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cf->iomem.flags = IORESOURCE_MEM; |
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/* pcmcia layer only remaps "real" memory */ |
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cf->socket.io_offset = (unsigned long) |
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ioremap(cf->phys_cf + SZ_4K, SZ_2K); |
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if (!cf->socket.io_offset) { |
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status = -ENOMEM; |
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goto fail1; |
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} |
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if (!request_mem_region(cf->phys_cf, SZ_8K, driver_name)) { |
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status = -ENXIO; |
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goto fail1; |
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} |
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/* NOTE: CF conflicts with MMC1 */ |
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omap_cfg_reg(W11_1610_CF_CD1); |
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omap_cfg_reg(P11_1610_CF_CD2); |
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omap_cfg_reg(R11_1610_CF_IOIS16); |
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omap_cfg_reg(V10_1610_CF_IREQ); |
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omap_cfg_reg(W10_1610_CF_RESET); |
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omap_writew(~(1 << seg), CF_CFG); |
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pr_info("%s: cs%d on irq %d\n", driver_name, seg, irq); |
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/* NOTE: better EMIFS setup might support more cards; but the |
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* TRM only shows how to affect regular flash signals, not their |
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* CF/PCMCIA variants... |
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*/ |
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pr_debug("%s: cs%d, previous ccs %08x acs %08x\n", driver_name, |
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seg, omap_readl(EMIFS_CCS(seg)), omap_readl(EMIFS_ACS(seg))); |
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omap_writel(0x0004a1b3, EMIFS_CCS(seg)); /* synch mode 4 etc */ |
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omap_writel(0x00000000, EMIFS_ACS(seg)); /* OE hold/setup */ |
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/* CF uses armxor_ck, which is "always" available */ |
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pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name, |
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omap_readw(CF_STATUS), omap_readw(CF_CFG), |
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omap_readw(CF_CONTROL), |
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omap_cf_present() ? "present" : "(not present)"); |
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cf->socket.owner = THIS_MODULE; |
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cf->socket.dev.parent = &pdev->dev; |
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cf->socket.ops = &omap_cf_ops; |
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cf->socket.resource_ops = &pccard_static_ops; |
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cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP |
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| SS_CAP_MEM_ALIGN; |
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cf->socket.map_size = SZ_2K; |
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cf->socket.io[0].res = &cf->iomem; |
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status = pcmcia_register_socket(&cf->socket); |
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if (status < 0) |
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goto fail2; |
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cf->active = 1; |
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mod_timer(&cf->timer, jiffies + POLL_INTERVAL); |
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return 0; |
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fail2: |
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release_mem_region(cf->phys_cf, SZ_8K); |
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fail1: |
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if (cf->socket.io_offset) |
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iounmap((void __iomem *) cf->socket.io_offset); |
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free_irq(irq, cf); |
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fail0: |
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kfree(cf); |
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return status; |
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} |
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static int __exit omap_cf_remove(struct platform_device *pdev) |
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{ |
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struct omap_cf_socket *cf = platform_get_drvdata(pdev); |
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cf->active = 0; |
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pcmcia_unregister_socket(&cf->socket); |
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del_timer_sync(&cf->timer); |
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iounmap((void __iomem *) cf->socket.io_offset); |
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release_mem_region(cf->phys_cf, SZ_8K); |
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free_irq(cf->irq, cf); |
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kfree(cf); |
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return 0; |
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} |
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static struct platform_driver omap_cf_driver = { |
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.driver = { |
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.name = driver_name, |
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}, |
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.remove = __exit_p(omap_cf_remove), |
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}; |
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static int __init omap_cf_init(void) |
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{ |
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if (cpu_is_omap16xx()) |
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return platform_driver_probe(&omap_cf_driver, omap_cf_probe); |
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return -ENODEV; |
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} |
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static void __exit omap_cf_exit(void) |
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{ |
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if (cpu_is_omap16xx()) |
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platform_driver_unregister(&omap_cf_driver); |
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} |
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module_init(omap_cf_init); |
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module_exit(omap_cf_exit); |
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MODULE_DESCRIPTION("OMAP CF Driver"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:omap_cf");
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